4.1:




 
  !
 "#$%&&'&
 ##
(
 #))
*
 "#$
(
4.2:
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




+
"#$,-"-.
##
(
/#
#+))

"#$,-"-.
##
(
"#$0-.
##
(
4.3:
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

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

"#$%&&'&
##
(

1
)
2
(
"#$
(
4.4:
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

3
3
 3"#$%&&'&

4*3
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"
138
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3
3"
(
5607
967742
"#$:56079677
(
(
4.5:



;3<===+
::3
<3*3>?**
3
"#$@-#A-
(
3
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"#$@-#A-
(
3
="#$=
(

=>23"#$=
(
<=>32+*
"#$=
(
<=>3)/#<2+*
=+>3>/#<2+*
"#$:==+
(
<
"#$)B:>32+2/#><2+2
"#$>B>32+2>/#><2+2
(
##
(
4.6:
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

-
3=

-

=

"#$%###
##
(
#))
--*
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"#$
(
##
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4.7:
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

-
3=

-

=

"#$%###
##
(
#))
--*
)"1=*"1>
(
"#$
(
##
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4.8:



-
3=

-

=

"#$%###
##
(
#))
--*
)"1=2-
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"#$
(
##
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4.9:
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

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3=
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lOMoARcPSD|36442750
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lOMoARcPSD|36442750

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lOMoARcPSD|36442750 4.1: #include int main(){ int i,n,k; k=1; scanf("%d",&n); if(n<0||n>8){ printf("ERROR"); return 0; } for (i=1; i<=n ; i++) k=k*i; printf("%d",k); } 4.2:
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 #include #include int main(){ int n; scanf("%d",&n); if(n<2){
printf("Khong phai so nguyen to"); return 0; } int m=sqrt(n); for (int i=2;i<=m;i++) if (n%i==0){
printf("Khong phai so nguyen to"); return 0; } printf("La so nguyen to"); return 0; } 4.3: #include #include int main (){
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 int n; scanf ("%d", &n); if (n>=1000) { printf("ERROR"); return 0; } int s=0; while (n>0){ s=s+n%10; n=n/10; } printf("%d", s); } 4.4: #include #include int main (){ int a,b; scanf("%d %d",&a,&b);
if(a<0 || b<0) printf("ERROR"); else { int tich=a*b; //UCLN int tmp; while(b!=0){
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 tmp=a%b; a=b; b=tmp; } int UCLN=a; int BCNN = tich/a; printf("%d\n%d",UCLN,BCNN); } } 4.5: #include #include int main() { float a,b,c,z,x,x1,x2;
scanf("%f\n%f\n%f", &a,&b,&c); z=b*b-4*a*c;
if(a==0 && b==0 && c==0) {
printf("Phuong trinh vo so nghiem"); }
else if(a==0 && b==0) {
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750
printf("Phuong trinh vo nghiem"); }
else if(b==0 && c==0) { x=0; printf("%f", x); } else if(a==0) { x=-c/b; printf("%f", x); } else if(z==0) {x=-b/2*a; printf("%f", x); }
else if(z>0) {x1 =((-b + sqrt(z)) / (2*a));
x2 =((-b - sqrt(z)) / (2*a)); printf("%f\n%f", x1,x2); } else if(z<0) {
printf("%f%+lfi\n",-b/2/a,sqrt(-z)/2/a);
printf("%f%-lfi",-b/2/a,-sqrt(-z)/2/a); } return 0; } 4.6:
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 #include #include int main(){ int n,i,gt; double s,x; s=1; gt=1; scanf("%d",&n); scanf("%lf",&x); if(n<=0){ printf("Error"); return 0; }else{ for(i=1;i<=n;i++){ gt=gt*i; s=s+pow(x,i); } printf("%lf",s); } return 0; }
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 4.7: #include #include int main(){ int n,i,gt; double s,x; s=1; gt=1; scanf("%d",&n); scanf("%lf",&x); if(n<=0){ printf("Error"); return 0; }else{ for(i=1;i<=n;i++){ gt=gt*i; s=s+pow(x,i)*pow(-1,i); } printf("%lf",s); } return 0; }
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 4.8: #include #include int main(){ int n,i,gt; double s,x; s=1; gt=1; scanf("%d",&n); scanf("%lf",&x); if(n<=0){ printf("Error"); return 0; }else{ for(i=1;i<=n;i++){ gt=gt*i; s=s+pow(x,i)/gt; } printf("%lf",s); } return 0; } 4.9:
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 #include #include int main(){ int n,i; double s,x; s=0; scanf("%lf",&x); scanf("%d",&n); if(n<1||x<0){ printf("Error"); }else{ for(i=1;i<=n;i++){ s=sqrt(s+x); } printf("%.4lf",s); } return 0; }
Downloaded by v?n ti?n Lê (vantienle525@gmail.com) lOMoARcPSD|36442750 4.10: #include #include int main(){ int n,i; double s,x; s=1; scanf("%lf",&x); scanf("%d",&n); if(n<1||x<0){ printf("Error"); }else{ for(i=1;i<=n;i++){ s=s+pow(x,i)/i; } printf("%.4lf",s); } return 0; }
Downloaded by v?n ti?n Lê (vantienle525@gmail.com)